JPS57143965A - Multifrequency signal receiver - Google Patents

Multifrequency signal receiver

Info

Publication number
JPS57143965A
JPS57143965A JP56030253A JP3025381A JPS57143965A JP S57143965 A JPS57143965 A JP S57143965A JP 56030253 A JP56030253 A JP 56030253A JP 3025381 A JP3025381 A JP 3025381A JP S57143965 A JPS57143965 A JP S57143965A
Authority
JP
Japan
Prior art keywords
input signal
sampling
digital filter
output
linear cyclic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP56030253A
Other languages
Japanese (ja)
Other versions
JPH0150152B2 (en
Inventor
Kensaku Fujii
Yasumasa Iwase
Yoshikatsu Shiraishi
Akira Fukui
Kazuto Hirose
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Original Assignee
Fujitsu Ltd
Hitachi Ltd
NEC Corp
Nippon Telegraph and Telephone Corp
Oki Electric Industry Co Ltd
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd, Hitachi Ltd, NEC Corp, Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd, Nippon Electric Co Ltd filed Critical Fujitsu Ltd
Priority to JP56030253A priority Critical patent/JPS57143965A/en
Publication of JPS57143965A publication Critical patent/JPS57143965A/en
Publication of JPH0150152B2 publication Critical patent/JPH0150152B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
    • H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To eliminate the need for an expensive window function generating circuit by supplying an input signal to a linear cyclic digital filter, which sends out an output signal based upon a past input signal, at every point of sampling. CONSTITUTION:Adders 44-46, multipliers 36-39, and one-sampling-period delay registers 51 and 52 constitute a linear cyclic digital filter to which a window function of a past sampling period is considered to be applied at every sampling point. When an input signal is inputted to a terminal 1, the linear cyclic digital filter performs discrete Fourier transformation and sends a read part and an imaginary part output to terminals 20r and 20i. Both the outputs are squared by multipliers 33 and 34 respectively and then added by an adder 43, whose output proportional to the amplitude of a component of a necessary detection angular frequency is sent out to a terminal 2. According to the addition output, the presence of the input signal having the necessary detection angular frequency is discriminated.
JP56030253A 1981-03-03 1981-03-03 Multifrequency signal receiver Granted JPS57143965A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56030253A JPS57143965A (en) 1981-03-03 1981-03-03 Multifrequency signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56030253A JPS57143965A (en) 1981-03-03 1981-03-03 Multifrequency signal receiver

Publications (2)

Publication Number Publication Date
JPS57143965A true JPS57143965A (en) 1982-09-06
JPH0150152B2 JPH0150152B2 (en) 1989-10-27

Family

ID=12298541

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56030253A Granted JPS57143965A (en) 1981-03-03 1981-03-03 Multifrequency signal receiver

Country Status (1)

Country Link
JP (1) JPS57143965A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0686338A (en) * 1991-12-31 1994-03-25 American Teleph & Telegr Co <Att> Method for detection of control signal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0686338A (en) * 1991-12-31 1994-03-25 American Teleph & Telegr Co <Att> Method for detection of control signal

Also Published As

Publication number Publication date
JPH0150152B2 (en) 1989-10-27

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